Question

Two open beakers one containing a solvent and the other containing a mixture of that solvent with a non volatile solute are together sealed in a container. Over time:

• A. The volume of the solution decreases and the volume of the solvant increases.
• B. The volume of the solution and the solvent does not change
• C. The volume of the solution increases and the volume of the solvent decreases
• D. The volume of the solution does not change and the volume of the solvent decreases

Answer 1

The correct option is C The volume of the solution increases and the volume of the solvent decreases

There will be lowering in vapour pressure for solution containing non-volatile solute. So the pure solvent will vapourise and increase vapour pressure till that vapour pressure will come in equilibrium so volume decrease.

As in solution, there is non-volatile solute, so it will not vapourise for vapour pressure to be in equilibrium, solvent vapour will come towards the solution. So, the volume of solution increase.

Hence, volume of beaker containing solvent (pure) will decrease and volume of beaker containing solution will increase.